stripos
查找字符串首次出現的位置（不區分大小寫）
中文(繁體)
中文(繁體)
查找"php" 在字符串中第一次出現的位置：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">stripos</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"You love php, I love php too!"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"PHP"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
strcmp
similar_text
number_format
printf
str_word_count
ucfirst
substr
strrpos
